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Ahmad A, Hugtenburg J, Welschen LM, Dekker JM, Nijpels G.Ahmad A, et al. Among authors: welschen lm.BMC Public Health. 2010 Mar 15;10:133. doi: 10.1186/1471-2458-10-133.BMC Public Health. 2010.PMID: 20230611Free PMC article.Clinical Trial.